← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 343 · 40 questions
TalentJR

The trick (Spot the pattern): 37 × 3 = 111, so 37 × (3 × k) is k written three times. 12345679 × 9 = 111111111, so 12345679 × (9 × k) is k written nine times. 1 × 8 + 1 = 9, 12 × 8 + 2 = 98, 123 × 8 + 3 = 987 …; and 11 × 11 = 121, 111 × 111 = 12321.

NameDateTime takenScore ___ / 40
  1. 1.12345679 × 63 =
  2. 2.12345 × 9 + 6 =
  3. 3.12345678 × 9 + 9 =
  4. 4.12345679 × 18 =
  5. 5.1234 × 9 + 5 =
  6. 6.11 × 11 =
  7. 7.37 × 27 =
  8. 8.1234567 × 9 + 8 =
  9. 9.12345679 × 54 =
  10. 10.37 × 6 =
  11. 11.37 × 24 =
  12. 12.111111 × 111111 =
  13. 13.123456 × 8 + 6 =
  14. 14.111 × 111 =
  15. 15.123456 × 9 + 7 =
  16. 16.37 × 9 =
  17. 17.123 × 8 + 3 =
  18. 18.37 × 18 =
  19. 19.37 × 12 =
  20. 20.12345679 × 45 =
  21. 21.12 × 9 + 3 =
  22. 22.123456789 × 8 + 9 =
  23. 23.11111 × 11111 =
  24. 24.1111 × 1111 =
  25. 25.1234567 × 8 + 7 =
  26. 26.12 × 8 + 2 =
  27. 27.12345679 × 36 =
  28. 28.123 × 9 + 4 =
  29. 29.37 × 3 =
  30. 30.37 × 21 =
  31. 31.37 × 15 =
  32. 32.12345679 × 81 =
  33. 33.12345679 × 9 =
  34. 34.12345679 × 63 =
  35. 35.12345679 × 63 =
  36. 36.12345679 × 27 =
  37. 37.12345679 × 72 =
  38. 38.12345 × 8 + 5 =
  39. 39.1234 × 8 + 4 =
  40. 40.37 × 21 =

Answer key

  1. 777777777
  2. 111111
  3. 111111111
  4. 222222222
  5. 11111
  6. 121
  7. 999
  8. 11111111
  9. 666666666
  10. 222
  11. 888
  12. 12345654321
  13. 987654
  14. 12321
  15. 1111111
  16. 333
  17. 987
  18. 666
  19. 444
  20. 555555555
  21. 111
  22. 987654321
  23. 123454321
  24. 1234321
  25. 9876543
  26. 98
  27. 444444444
  28. 1111
  29. 111
  30. 777
  31. 555
  32. 999999999
  33. 111111111
  34. 777777777
  35. 777777777
  36. 333333333
  37. 888888888
  38. 98765
  39. 9876
  40. 777

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks